Nut lock



l Patented .uly 28, QS

PATENT F'FICE YASUHIKO NAGANO, OF LOS ANGELES, CALIFORNIA NUT LOCKApplication filed February 17, 1930. Serial No. 429,103.

This invention relates to improvements in nut locks, and -its objectsare to provide an elicient device of this character which Willpositively prevent a nut, when drawn B'irmly in position, from looseningupon the bolt.

The objects are to prevent loosening of nuts, and to provide meanswhereby the nuts kmay be clamped and retained in'position.

Toaccomplish these objects, I provide a Washer adapted to be positionedbeneath the nut,vand a plurality of projections extending from theperiphery of the Washer,

: and adapted to engage With the threads of the bolt, and anotherprojection adapted to engage With any face or corner of the nut toprevent the' same from turning.

In the drawings, Figure l is a sectional elevation of a nut and boltprovided with my improved locking device, the bolt being shown inelevation. Fig. 2- is a top plan View of the locking device, and showsthe bolt in section. Fig. 3 isa plan or" the blank from Which the deviceis made, showing the form thereof before bending the projectionsthereon. Fig. 4 is a sectional elevation of the locking device. Fig.

a modified form of the device. Fig. 6

side elevation ot' the modified form. Referring in detail to thedrawings, my

improved locking device consists of a Washer 7, having projections 8adapted to engage With the threads of a bolt 9, when Y pressed by a nutl0 thereon, and having a lug ll, adapted to engage with a face l2, or

corner 13, of the nut. The bolt threads 14 VTvvill be slightly upset byprojections 8,

thereby preventing the turning or loosening' of the bolt, and the lugll, after the nut is tight, is to be hammered and driven against theface of the nut.

In the modified form shown in Figs. 5 and 6, projections 8 are onmovable pavvls 15, mounted in knuckles 16, integral With the Washer 7. Y

In use, the nut is irst tightened and turned vfirmly in position. Thisflattens the projections and forces them into engagement With the,threads of the bolt. The lug isa 5 is a top plan oi is then drivenagainst the nut, thereby preventing the nut from turning. Theprojections :further slightly upset the threads at the bottom of thenut, thereby preventing the nut from loosening. the lug is driven awayand out of engagement with the nut, and the nut may then be turned oil.The edges of the projections further engage with the bottom of the nutto prevent the turning thereof. Through engagement with the threads ofthe bolt, the Washer Will not turn While the nut is being tightened.

F rom the foregoing description and draW ings, it may be etiicient nutlock, capable of iirmly holding a nut from turning and loosenin l/Vhatis claimed is:

l. A nut lock, comprising a Washer to be positioned beneath a on theperiphery of the Washer, pawls mov ably mounted in the knuckle members,engaging with the threads of the bolt, and a lug integral With theWasher to be driven 11i-engagement with the nut at any facet or cornerthereof.

2. A nut lock, knuckle members on the periphery of and integral With theWasher, and sharp-pointed pavfls operatively mounted in the knucklemembers, and engaging With the threads on 'opposed sides of the bolt.

3. A nut lock, comprising a Washer positioned beneath a nut,-knucklemembers integral with and on the periphery of the Washer, sharppointedpavvls operatively mounted in the knuckle members, and adapted to engagewith the bolt threads on opposed sides of the bolt, and a lug integralwith the Washer to engage with the periphery of the nut.

YASUHTKO 'NAGANO seen that I have provided an z nut, knuckle memberscomprising a Washer,

To remove the nut, .f 3

.t mi

